Fountain pen



E. BERGQUIST FOUNTAIN PEN 'Filed Nov. 25, I924 Nov. 27, 1928.

3 3 INVENTOK EdwardBergquist ATTORNEY Patented Nov. 27, 1928.

EDWARD BERGQUIST, OF NEW YORK, N. Y.

FOUNTAIN PEN.

Application filed November 25, 1924 Serial No. 752,127.

The invention herein described relates to fountain pens and is particularly directed to that type of fountain pen which is termed in the art, a self filling pen.

Pens of the self filling type are not essentially new in the art and for the greater part have a flexible tube which serves as the ink fount or container.

In such devices, a means is provided for collapsing the flexible tube or ink fount so that a partial vacuum is created therein. Then by immersing the pen point and feed in the ink and releasing the pressure on the collapsible tube, a suction is created which draws ink into the tubing or fount of the pen.

Flexible tubes are objectionable as they soon become impaired and it is almost impossible to completely exhaust the contents of the flexible tube which, of course, would require complete collapsing thereof, and

under the best conditions, will not give a maximum fount capacity.

The invention hereinafter described relates to pens of the self filling type such as heretofore described in my co-pending application Serial No. 576,368, filed June 20, 1922, issued as Patent No. 1,524,284, January 27, 1925.

In this application there is disclosed an arrangement which gives a maximum fount capacity for a given barrel size, by utilizing a compound piston, that is, a pair of tubes with intermediate packings which permit the tubes to slide one on the other telescopically. By using extremely thin tubing, a very large fount capacity is permitted.

The present invention embodies the essential features of my co-pending application, above referred to, and has additional features which serve to maintain an easy action of the sliding parts of the fount and prevent possible leakage.

The primary object of the present invention is to provide a means for preventingleakage in the event of ink passing the packings of the pistons and maintain a suitable air vent which will revent air trapping.

Referring to the diawings:

Fig. 1 is a sectional view of the pen. 1LFig. 2 is a detailed view of the tip and inner tu e. i

Fig. 3 is an enlarged view of the packing of the outer tube. V

Figure 4 is an enlarged view broken in section illustrating telescopic tubes, packing, etc.

Fig. 5 is an enlarged view of the inner tube of the fount, illustrating the valve mechanism I and air vent on a large scale.

Figure 6 illustrates a modified arrangement of forming the ducts and valve lug.

Figure 7 illustrates a modified orm of valve and plug. In self filling pens, it is very desirable and in fact, almost imperative, that some means be provided for effectively cleansing and scavenging the ink fount of any residual charge of ink. Obviously, to attain such a result, it is necessary to provide a means of preventing air binding or pocketing within the fount and means for completely filling and completely discharging the fount.

It is one of the objects of the present invention to provide, in conjunction with sliding pistons, which form the fount and means for filling and discharging the same, an air vent. to permit easy action of the fount members and prevent air pocketing.

A further object is to provide, in conjunction with the above, an arrangement which will prevent passing of ink to the exterior of the pen in the event of the ink pistons.

In carrying out the invention in one form, which is illustrated in the drawings, I provide the usual outer barrel 1, which has exterior threads 2, forming a convenient means for screwing down the cap 3.

Suitably secured within the barrel 1, is a tip 4, which, as illustrated, is screw threaded as at 5, and has a central duct 6, at the forward end of which is arranged the pen 7, and feed 8. Connecting with the duct 6, is the inner tube member 9, of the fount which cooperates with an outer tube member 10, to form the complete fount. The outer tube member 10, is of less diameter than the interior diameter of the barrel 1, so that an insulating air space 11, is provided between the passing the outer member of the fount and the barrel of the pen.

The inner tube 9, has a packing 12, at its outer end and this packing, as illustrated in Figure 2, is held in place by two washers 13,,

over as at 17, the headed rivet 15, is dropped thru' the aperture with its head 16, resting against thefspun over end of the tube. The

washer 13, is then placed on the rivet to form a. backing for the cork packing 12, and a second washer 13, is dropped over the rivet against the end of the cork packing. The rivet end is then spun over its second washer pressing all the parts to a desired degree to make a tight backing between the cork backing 12, and the inner surface of the outer fount tube 10.

Slots 18, are provided in the walls oi' the inner tube 9 so that the interior of said tube connects freely with the interior of the outer tube member 10.

. I As both tube members of thefount are of very thin material, preferably noncorrosive tubing, these parts form a comparatively large tount and one with a maximum capacity :as compared with the size of barrel employed.

I The outer founttube 10, at its inner end, is likewise provided with a packing 19. This is conveniently held in place by spinning an annular groove 20, in the tube 10, passing a washer 21, against the interior shoulder thus formed, inserting the packing 19, and second compression washer 22, and spinning the and its packing 19, and is suitably secured in the end of the tip 4.

The outer end of the fount tube 10, has secured within it, a plug or cap piece 24, which closes the end of the tube except for the ducts hereinafter mentioned.

. The cap 24, is bored as at 25, to receive the end 26, of a valve stem and is counter bored asat 27. There is an atmospheric duct 28,

connecting with the counter bore 27, and a perforation 30,1eading from the duct 29, to the outside of the stem where it connects with the interior of the outer tube 10, of the fount. The valve stem 26, has a head 31, sliding within the tube 10, and there is an air duct 32, passing through the end of the head and to the backside thereoflwhere it connects with ,the interior of the tube 10, and through the opening 30, duct 29, counter bore chamber 27, and duct 28, to atmosphere Bet-ween the piston packing 12, or end of i the inner fount tube 9, and the inner end of the member 31, there is preferably arranged, a soit packing 33, containing an absorbent material 34. j

In the event of moisture forming between theend of the inner tube and the outer tube,

this packing and absorbent material will take itup, so that it cannot be forced out through the duct 28.

Attention is called to the tortuous passage from the inner end of the valve plug 81, to the exterior of the cap 2st, with the intermediate chamber 35, which has considerably greater area than that of the ducts leading to it and therefrom;

In order to cushion the inner end of: the fount tube 10 a soft packing washer 36, is inserted between the end of the tip 1, and surrounding the inner tube'9. This washer prevents breakage or stripping of the threads of the cap 2 1, when the latter is screwed down to the end of the barrell, and also provides a leak tight joint when the' pen is filled by a downward thrust of the outer tube 10.

In Fig. 5, there is illustrated a modificacation of the packing and ;tube. In this case, the innertube 9, is spun in to :to ma tube extension 50, of. less diameter than that of the tube 9. A washer 51, is then slipped over the tube followed by the packing 52, and a compression washereg.

The outer end of the tube 54, is then spun down over the outer washer 53, until the desired compression is secured upon the packing 52. I

A stop plug 55, is then inserted in the con tracted portion of the tube and suitably cemented or secured therein toeffectually close it. 1 V

The assembling operation of the parts will be quite obvious. The inner tube 9, is passed through an outer tube 10, and its inner end is secured to the tip 4, with the washer 36 in place.

The packing 83, and absorbent filler is then inserted in the outer end of the outer tube and the cap 2 1, withits valve plug is erted and secured in the outerend oi the tube 10. These parts, of course, are all assembled in the barrel..

necessary air vent and valve for the plug heretofore described.

In Figure 6, the plug12 1, is threaded as at 55, to engage the threadec opening in the outer barrel 1. The outer barrel 10, of the telescoping ink fount is secured to a reduced portion of the plug 24, which is'slightlyreduced below the threads 55.

The plug 24, is tu1 'ned down to form a chamber 56, and asmall duct 57-, .is formed diagonally through the end 58,0f the plug forming a communication between the interior of the tube 10, and the chamber 56. A

small duct 59, extends laterally from the chamber 56, into the body of the plug 24, and communicates with the lateral duct or air vent 60. Just in advance of the end 58, of the plug 24, there is a light spring 61, one end of which abuts against the washer 62, having a perforation 63. The spring forms a resilient spacer. A soft packing 83, is arranged between this washer 62, and the end of the inner telescoping tube 9. It will be observed that this form of plug and valve is substantially the same as that of Figure 4, except that the valve spindle is disposed of and the entire system of ducts with intermediate chamber, is formed directly within the single piece plug 24.

Figure 7 illustrates a simpler construction with a single piece plug and valve than that shown in Figure 6. In this form, a central bore 64, is made in the plug 24, to provide a chamber and this is then plugged as at 65.

Lateral ducts, 66, 67, communicate respectively with the end of the plug 2a, and chamber 64:. and the exterior of the plug.

In this figure. there is illustrated the same arrangement of light spring, disc and pack ings shown in Figure 6.

There is a certain advantage in the use of these springs, discs and packings in that they provide a perfect air release and yet trap in liquid which may pass the packings between the telescoping tubes. A light spring always holds the washer in place against the soft packing and an absorbent packing at the end of the inner tube and even with rough handling of the pen. as the telescopic tubes are withdrawn or pushed together. provide cush-. ioning eflects which prevent binding and breakage.

The elemental form and design of these parts might be modified to any reasonable degree without departing from the spirit and in ent of" the invention.

IVhat I claim as my invention and desire to secure by Letters Patent is:

1. In a fountain pen. a pen barrel, an ink fount arranged therein. said fount consisting of telescopic tubes of different diameters, one tube communicating with the pen point and communicating with the interior of the outer tube and a plug secured to the outer tube. anatmospheric passage centrally arranged therein and a valve plug having its stem secured in the passage of the first named plug and with passages communicating with the air passage of the first named plug and the interior of the outer tube.

2. In a fountain pen, a pen barrel, an ink fount arranged therein, said fount consisting of telescopic tubes of difierent diameters, one tube communicating with the pen point and communicating with the interior of the outer tube packings intermediate the tubes and a plug secured to the outer tube, an atmospheric passage centrally arranged therein, a valve plug having a hollow stem secured in the first named plug and a packing between the valve plug and the telescoping tube.

3. In a fountain pen, a pen barrel, an ink fount arranged therein, said fount consisting of telescopic tubes of different diameters, one tube communicating with the pen point and communicating with the interior of the outer tube, a plug secured to the outer tube, and having a centrally arranged atmospheric passage therein, a valve plug having its hollow stem secured to the first named plug and apacking of absorbent material between the valve plug and telescoping tube.

4. In a fountain pen having an ink fount comprising telescopic tubes, the inner tube having openings communicating with the outer tube, a packing on the inner tube adjacent to the openings, a plug secured to the outer tube having a centrally arranged valve opening, an opening to the atmosphere connected therewith and a packing between the inner tube and the plug for closing the valve opening. g

5. A valve plug for fountain pens comprising a main plug member having a centrally disposed chamber communicating with atmosphere, a hollow stem fitting within said chamber and having a passage communicating with the exterior of the stem, a valve plug member at the end of the stem and spaced from the main plug member, and avalve aperture through the valve plug member comn'iunicating with the spacing.

6. A valve plug for pens having an air duct of varying capacity extending therethrough, a washer operatively arranged with reference to the inner end of the plug and a resilient spacer intermediate the washer and plug.

EDWARD BERGQUIST. 

